When to call torch function ?

[christophedemey]

Hi

When the scanview is done loading there is no event to start the toggle of the camera.
Following your example i had to adapt like this else the toggleflashlight would throw a nullreferenceexception.

        public MainPage()
        {
            InitializeComponent();
            Task.Run(async() =>
            {
                await Task.Delay(5000);
                GoogleVisionBarCodeScanner.Methods.ToggleFlashlight();
            });
        }

        private async void CameraView_OnDetected(object sender, GoogleVisionBarCodeScanner.OnDetectedEventArg e)
        {
            List<GoogleVisionBarCodeScanner.BarcodeResult> obj = e.BarcodeResults;

            string result = string.Empty;
            for (int i = 0; i < obj.Count; i++)
            {
                result += $"{i + 1}. Type : {obj[i].BarcodeType}, Value : {obj[i].DisplayValue}{Environment.NewLine}";
            }
            Device.BeginInvokeOnMainThread(async () =>
            {
                await DisplayAlert("Result", result, "OK");
                //await Navigation.PopModalAsync();
            });
        }

[JimmyPun610]

ToggleFlashlight method have to call on the page that the camera is on.
Take the sample as an example, Page1.cs will have the implementation on it.

[christophedemey]

Hi @JimmyPun610
I have checked the example which has a button, i want the torch to be on automatically when the camera is loaded.
When i try to do this while it's loading i get a nullreference exception.

How can i achieve this?

Thanks

[JimmyPun610]

Hi @christophedemey
I updated the version to 4.2.1(uploading) and added a property named DefaultTorchOn
You may set it to true if you need to switch the light on when opening the page.
Please note that you will need to switch off the light in event OnDisappearing (You can refer to sample), otherwise, torch will not switch off in iOS.

Please let me know if it works, or you may close the issue. Thanks